HYDROTAZA.—OPHYRA. 323 
which have the femora near the tip and the tibie at their base denticulate or excavate. 
The eyes are bare*, contiguous or subcontiguous in the male, broadly separated by 
the front in the female; the antenne are shorter than the face; the arista is bare or 
pubescent; the abdomen is ovate, without true macrochete, though hairy in the male ; 
the tegule are unequal, the lower scale extending beyond the upper. 
In the Central-American collections before me I have detected specimens of a single 
species, agreeing with one of the commonest European forms. 
1. Hydrotza dentipes. 
Musca dentipes, Fabr. Syst. Antl. p. 803 '. 
Anthomyia dentipes, Meigen, Syst. Beschr. v. p. 144°. 
Aricia dentipes, Zett. Dipt. Scand. iv. p. 1426°. 
Hydrotea dentipes, Schin. Faun. Austr., Dipt. 1. p. 615*; Meade, Ent. Monthly Mag. xiv. p. 251° ; 
Osten Sacken, Cat. Dipt. N. Am. p. 166°. 
Hab. Norta America °.—Mexico, Xucumanatlan in Guerrero (H. H. Smith); Costa 
Rica, Volcan de Irazu 6000 feet (Rogers).—Eurore 1, 
OPHYRA. 
Ophyra, Robineau-Desvoidy, Essai sur les Myodaires, p. 516 (1830). 
This genus agrees in many respects with the preceding (Hydrotea), but differs from 
it in having the front femora simple ; the abdomen is metallic in some of the species. 
In the Central-American collection before me two species are represented. 
1. Ophyra argentina. 
Ophyra argentina, Bigot, Ann. Soc. Ent. Fr. 1885, p. 302"; Gigl.-Tos, Mem. R. Accad. Scienze di 
Torino, ser. 2, xlv. (sep.) p. 26’. 
Hab. Mexico, Mexico city (H. H. Smith), Orizaba and 'Tehuacan *.—SoutuH America, 
Buenos Ayres}, 
A single female specimen from Mexico city, perfectly agreeing with Bigot’s short 
description. 
2. Ophyra ——? 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith). 
A single female specimen, unicolorous shining black, with the costa of the wings, 
except at the base, blackish-brown. 
* The species of Hydrotcea which have the eyes pilose are separated by Rondani under'the gencric name 
Onodontha. : 
